Surface-enhanced Raman scattering of molecules adsorbed on gold nanorods: off-surface plasmon resonance condition

Nikoobakht, Babak; Wang, Jianping; El‐Sayed, Mostafa A.

doi:10.1016/s0009-2614(02)01492-6

Cited by 399 publications

(212 citation statements)

References 24 publications

Supporting

Mentioning

197

Contrasting

Order By: Relevance

“…The color transition of HAuCl 4 solution from pale yellow to a ruby red indicates the change in metal oxidation state and formation of AuNPs. Spherical AuNPs exhibit absorption peaks in visible region whereas the anisotropic particles give rise to absorption peaks both in visible and near infrared (NIR) region [27][28][29]. Figure 2A shows UV-Vis absorbance spectra of AuNPs synthesized at 100 °C and at room temperature.…”

Section: Experimental Details Materials and Methodsmentioning

confidence: 99%

Mimosa pudica Flower Extract Mediated Green Synthesis of Gold Nanoparticles

Mapala¹,

Pattabi²

2017

NanoWorld J

View full text Add to dashboard Cite

The use of Mimosa pudica flower extract in the synthesis of highly stable gold nanoparticles (AuNPs) is reported here. On treatment of aqueous chloroauric acid with crude aqueous extract of Mimosa pudica flowers, rapid reduction of Au 3+ ions at room temperature was observed without the need of any additional reducing or stabilizing agent. The synthesized AuNPs were characterized by UV-Vis spectroscopy, Field Emission Scanning Electron Microscopy (FESEM), Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS) and Zeta potential, X-Ray Diffraction (XRD) and Fourier Transform Infra-Red (FTIR) spectroscopy. UV-Vis studies indicated the formation of AuNPs. The AuNPs were almost spherical in shape with an average particle size of 24 nm as determined by FESEM, TEM and DLS particle size analysis. XRD studies and high resolution TEM images ascertained the crystalline nature of the AuNPs. FTIR analysis of flower extract and AuNPs showed the possibility of phenolic group as responsible for the reduction of Au 3+. The stability of the AuNPs was analyzed by Zeta potential measurements. A negative Zeta potential value of -33.4 mV proved the stability of the AuNPs. The as synthesized AuNPs exhibited good catalytic activity in the model reduction reaction of 4-Nitrophenol to 4-Aminophenol.

show abstract

Section: Experimental Details Materials and Methodsmentioning

confidence: 99%

Mimosa pudica Flower Extract Mediated Green Synthesis of Gold Nanoparticles

Mapala¹,

Pattabi²

2017

NanoWorld J

View full text Add to dashboard Cite

show abstract

“…These studies showed only small (10 1 -10 2 ) enhancements [35,36]. However, recent theoretical [37] as well as experimental [38,39] studies has shown that under certain conditions the CT enhancement can be much larger than is usually predicted earlier. In addition, large SERS enhancements have also been observed for molecules interacting with small nanoclusters or nanocrystalline semiconductor surfaces, both of which are not expected to support plasmon resonances and thus should show only small EM enhancement [40][41][42].…”

mentioning

confidence: 87%

“…The Becke-Perdew (BP86) XC-potential [91,92] and a triple-polarized slater type (TZP) basis set from the ADF basis set library were used in our simulation. The validity of using DFT and ADF for quantum mechanical SERS calculation has already been proven by many researchers [37][38][39][40][41][42][43][44][45][46][47][48].…”

Section: Computational Approach and Detailsmentioning

confidence: 98%

Metal−Molecule Schottky Junction Effects in Surface Enhanced Raman Scattering

2010

View full text Add to dashboard Cite

We propose a complementary interpretation of the mechanism responsible for the strong enhancement observed in Surface Enhanced Raman Scattering (SERS). The effect of a strong static local electric field due to Schottky barrier at the metal-molecule junction on SERS is systematically investigated. The study provides a viable explanation to the low repeatability of SERS experiments as well as the Raman peak shifts as observed in SERS and raw Raman spectra. It was found that strong electrostatic build-in field at the metal-molecule junction along specific orientations can result in 2-4 more orders of enhancement in SERS.

show abstract

“…As single-stranded DNA molecules are zwitterions, and doublestranded are polyanions, their affinity towards polycationic GNR stabilizer (cetiltrimetilammoniumbromide, CTAB) is various. The GNRs plasmon-resonant [7][8] labels are functionalized with probe single-stranded oligonucleotides by physical adsorption or by chemical attachment. By adding complement targets to the GNRs-probe conjugate solution a formation of aggregates is observed.…”

Section: The Use Of Nanorods For Oligonucleotide Detectionmentioning

confidence: 99%

“…Extinction and scattering spectra were measured in the wavelength range from 450 to 900 nanometers which includes the transversal and longitudinal plasmon resonance [7][8] bands of GNRs. The particle and aggregate average size were measured by the dynamic light scattering method (DLS), and the particle shape and cluster structure were examined by transmission electron microscopy (ТEM).…”

Section: The Use Of Nanorods For Oligonucleotide Detectionmentioning

confidence: 99%

Synthesis and Application of Nanorods

Sadeghi¹

2012

Nanorods

View full text Add to dashboard Cite

Surface-enhanced Raman scattering of molecules adsorbed on gold nanorods: off-surface plasmon resonance condition

Cited by 399 publications

References 24 publications

Mimosa pudica Flower Extract Mediated Green Synthesis of Gold Nanoparticles

Mimosa pudica Flower Extract Mediated Green Synthesis of Gold Nanoparticles

Metal−Molecule Schottky Junction Effects in Surface Enhanced Raman Scattering

Synthesis and Application of Nanorods

Contact Info

Product

Resources

About